64 dart questions

I know you didn't ask about 66 doors, but there is an important difference. In 66 the lock cylinders changed and so the cutout in the door skin for the lock cylinder has a different shape. Otherwise, 66 doors will fit on a 64 or 65

Learned that one the hard way.

I think 63 doors have some difference in the shape of the door latch, but I'm not real clear on that.